Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46c76abcbcf675f…

MALICIOUS

PDF

94.8 KB Created: 2021-07-30 00:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8fc1bf60f34b703f6ab70bcad79f84a SHA-1: a8494e98fff0c7dd8abe290fd4ed1b7ef7e13b5d SHA-256: a46c76abcbcf675fcb089b02503e4b08899181c116ae23bea751f90adde7499e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common technique to trick users into executing malicious commands, likely to download a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=how+to+activate+autocad+2013+crack PDF link annotation
    • https://unibel.pl/pliki/upload/file/zaduxokasomoduvorow.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11092750655.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9cc0db37647f03b7dded5a34c6fcca99/vapemerebedewo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/38328590441.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/78752869302.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076de0a8e9fc---11809393590.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/mizijiku.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d899de5c---sapevigipim.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070ddcc7abfa---96456242552.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/mibaxezaj.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/60787270828.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/75474358153.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/viwonukubuj.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107100858062352.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/4862368533.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/61666300340.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d4ae43a09603f3dac9f36fd77664f207/94904908175.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/benolovunaguwodevukuta.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160901cc13203d---mosiritibolurixogazezuxev.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b606522c5c8c0ac88d91a5ee21beaa06/boxulep.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/48867487397.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/bevupukozi.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/66518553334.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/zebedujugisikeguj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/43b519f723a325d040da643c99a28ae3/mazazivurif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 10844 bytes
SHA-256: 7319f4a50fb76cc81f0dcd9c4ac77c7adf40847d4d2b63b0ff2a227db122d853
font_01_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB3 17292 bytes
SHA-256: 590baa6597bfbe2d1ce444641aa2c0b395f7d087b7f4b0e0dfeb5bd169685280

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